Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
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Switch: STLSMO03DS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
314-321 A St Louis MO 9533 SOUTHWESTERN BELL 520      
314-351 A St Louis MO 9533 SOUTHWESTERN BELL 520      
314-352 A St Louis MO 9533 SOUTHWESTERN BELL 520      
314-353 A St Louis MO 9533 SOUTHWESTERN BELL 520      
314-457 A St Louis MO 9533 SOUTHWESTERN BELL 520      
314-481 A St Louis MO 9533 SOUTHWESTERN BELL 520      
314-752 A St Louis MO 9533 SOUTHWESTERN BELL 520      
314-832 A St Louis MO 9533 SOUTHWESTERN BELL 520      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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